promax super budget brakes

[Shebeen]

wrenching the gardene executives ride yesterday.

he has a new (old) chariot, a schwinn mesa with promax hyrdaulic brakes. 

Front has sooo much air in it that it just don't work. (either that or pistons are seized).

 

I have bleed kits for sram+ shimano, but this is something else.

I have found online guides for later models from this brand, but this is very basic. no bleed port on levers, only the main reservoir which has two screws and a rubber  flexible gasket.

Trying to get air out, I flipped everything so lever is bottom, caliper highest and just tried filling up from top. (i was able to get some sort of vacuum seal)

 

suggestions welcome - he is back next sunday (assuming he can navigate the roads with back brakes only for another week!)

20250824_124127.heic20250824_124135.heic

 

 

 

 

 

[Shebeen]

pics are these irritating heic format

[RobertWhitehead]

Open the reservoir and push oil from the caliper to flush the bubbles. You can also use a rag / toilet paper to clean the reservoir out before pushing new fluid. I just fill the reservoir back up from the caliper side and majority of the time this works

 

[Shebeen]

54 minutes ago, RobertWhitehead said:

Open the reservoir and push oil from the caliper to flush the bubbles. You can also use a rag / toilet paper to clean the reservoir out before pushing new fluid. I just fill the reservoir back up from the caliper side and majority of the time this works

 

ja I tried that initially, but trying to work out the way to push it when you don't have the right adaptor to create a bit of pressure. I basically had just the syringe pipe pushed into the caliper bleed port. Obviously the park tool guideline (on a newer model) the guy has all the different nifty bits.

 

I guess my question is, how would you do this in the bundus? I'm unlikely to go find the exact adaptor needed - unless this sort of thing is easy enough to find. 

https://www.rookiesports.co.za/product/fluir-workshop-universal-bicycle-hydraulic-disc-brake-bleed-kit/

 

[RobynE 🚵‍♀️]

Just saying! 😊 
 

 

[Shebeen]

28 minutes ago, RobynE 🚵‍♀️ said:

Just saying! 😊 
 

 

noted, that thought did cross my mind!! BUT being able to diagnose and fix something that is not actually broken is more rewarding than throwing a credit card.

[RobertWhitehead]

I am keen to help if you need assistance 

[RobynE 🚵‍♀️]

3 hours ago, Shebeen said:

noted, that thought did cross my mind!! BUT being able to diagnose and fix something that is not actually broken is more rewarding than throwing a credit card.

I agree 💯- but at R999 I’d be hard-pressed to say no 😂 

[droo]

Same procedure as bleeding OG Shimano hydros - reset caliper pistons, remove reservoir cap, fill up the reservoir, open the caliper bleed port and wait for the fluid to flow through. If it doesn't, pull the lever a few times to start the siphon. Keep an eye on the reservoir to make sure the oil level doesn't get too low.

When the bubbles stop coming out, close the bleed port, put a bleed block in, pull the lever repeatedly till no more bubbles come out of the timing port, fill up the reservoir again, replace bladder, replace cap, clean caliper, replace pads, replace wheel, ride bike.

[Shebeen]

6 hours ago, droo said:

Same procedure as bleeding OG Shimano hydros - reset caliper pistons, remove reservoir cap, fill up the reservoir, open the caliper bleed port and wait for the fluid to flow through. If it doesn't, pull the lever a few times to start the siphon. Keep an eye on the reservoir to make sure the oil level doesn't get too low.

When the bubbles stop coming out, close the bleed port, put a bleed block in, pull the lever repeatedly till no more bubbles come out of the timing port, fill up the reservoir again, replace bladder, replace cap, clean caliper, replace pads, replace wheel, ride bike.

awesome.

 

i only had SRAM/Avid until recently, so never did this. shot shot.